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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da7e88e0d6f240062d2eada5c79839fd6a47ede992c23932b7246a2b969ceecf' 
  AND token = 'EZUeYnqiaFT2ZJUNJ8r/m9N75GVwCzsS8OGqhPox1z8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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