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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c6f26b7493d47a109f4cdbc728bdbdaf86f7b27c6129e837edb89a5b554d82' 
  AND token = 'hQoUrQFQfrbTgPNZx9E/lvQu/S9l8IPz+FQIQ1cAjoI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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