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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7bf9aa24ecd25e9faaf03a404352aa7a65703f2c27498585d89c86f123daa7f0' 
  AND token = 'zd0TK807u9vOtIW2qimDlUE9+Ewhqv8llRrlMQNFPc0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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