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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7957a6679531efdb38bc0c5c82f76a94fb5eec20c51c1bc71fc68d80aae2163' 
  AND token = 'dlU4gSKSk5e51olKmLFQFjZ1sNoRK3z/Zq38yZfAyDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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