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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71865839aa5a086a91029556237dbc51e38f2eca803e57e013fbe4d02979fef3' 
  AND token = 'GdX8/6EasMppLKf+df7uIoeQx4K6oJS2/FdVmIc3108=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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