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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc6828150002b92d916a803d3c9e08607885cd8a2f2db271c95298c4f5bce055' 
  AND token = 'Sa5lTxoAnq5y3fax15r9IMAfy55jQsGOvPh3ka8Wm8U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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