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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0a766af48a86fced40c7fd6ea8f7a7956a79318761ad600adf88e807cfe843' 
  AND token = '86dxrUOiUqbu8StCZYSaYTgXNUuCyoJScdo/JDDIVK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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