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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c08f0a54b5b96f94021914139d0be3b493eafb14505c003996cafae7e058e94b' 
  AND token = '3v3lSK0TzJHcNcNO51GeyniXUl4icIffWV7usyIaBgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00086

JSON explain

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