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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ffae5be67e6e58e872e1bc68d59dacb6ad8a486d2a08e530ec26a309490f5b04' 
  AND token = '3YYQ5K7001WuNl0T+4mM9xAcQZRpgEuOeIpU/hk7b58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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