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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd2700b68470b4c677df31d9429bf9ece68fc3dbf193da0b6cf5969d09735a83c' 
  AND token = 'evPnGdINsR5IQAhJJy+2BeH3CxSoHADGU0ZFTrvFdXk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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