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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3754e8f08bda537a6e01b55a6ed0d909489f2b0cbd8b9c2bdbb4c7ea61a9d8e' 
  AND token = 'brI8rHI0bvi2EsSarquXLeZDsHa71zrUcAH/pvl4pds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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