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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eeffaa82b18814c4fabcb3ff143db2b4708f4a1add95747fb191dd5a4a5235dc' 
  AND token = 'lh0sJautn+sBCgSinfQ6e/DdsUIVVJoiINVaapk1uDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00101

JSON explain

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