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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9261bb4a469efeda9f8a5793040e5662201f9c6ad40430e392da14e536f9f6a6' 
  AND token = 'K2WJGqD4RTe51cE6CNcnwPNkApt0YAF/v1rFTPjBoM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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