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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcc50d85f07a1028e093e1a014af5d9354e7aa3687e71939d9e89541d299d51a' 
  AND token = 'ph120V3BqFRkXKkYTmkP0ShOT2MmbWzDfOJ7gcSaB4A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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