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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4e696a63783729e23af2a1917690f4559cd7597a5f901b1a8ef850defd7d726' 
  AND token = 'yWNpaLXdt2fc3Bhe0pLZgT6qtdKpVbOY8OQOUSKCIcQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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