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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee3fc16f5c1fc27c3ca61ecf8500b3afd8ee6083f39403d4eb83807660528cce' 
  AND token = 'NDuSZ5c5yfkFSquz6itT+7D6EvVDVPPGp4CIgP2nUZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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