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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73136ed360409a3b33faeb7d02ee1198f184d1037584325d7c86bb4cbe5505be' 
  AND token = 'Ev5xKahN3UEqyzChRA5Gc230xPBIIdfjNAmR/yx4CdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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