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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '277d76ff20bfe4a6b70e3964afec48c31e731e12a1de1342d438fdfa3c2626c6' 
  AND token = 'Xsylp87sD698x5W8Xa4wLm1fMQYaYNBLCUDELrUIgFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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