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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8012107c164b4a3ff496d746e46b851d19f5fb665ee4b9d37c8e8f851420b176' 
  AND token = 'XuCuJOdXxgLdvPpghSLgllqXsAk41JJHJ/HIVQdc7yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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