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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd720dd92b51a7192dbd06522e3e786f91e4856fecf029ec405f2ee466456a1e6' 
  AND token = 'wpsbOcysGs5+Eh9kI2O8g21GxvG3vSTs0VJLiik8vKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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