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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33dda031e5f8de58b2eb44062bd3ff023db815057148ad5ff1716554d2c7c94e' 
  AND token = 'a48jwVWIlU2ML/+yk/jildnQSMees5vPlcd48SITXL8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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