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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0235a2dd00cec8c11f74aa34b4cca2133dc3a99298d69b649f333fd993fd0cd8' 
  AND token = '2yB6pnYGX+8m0b84HEbdk/ozA9Jk45PihebDrJIV59M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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