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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e79d162736999241943a915e1b32443cffbd79d437b48ac8bb7b38f5545217e' 
  AND token = 'uYXTu4g8P5jC+x4CQ4acHpeXrk476et0gEghPVsJ1YU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}