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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b011b167adb8207b745b76f3be1213987e34c8613dcc789990a3de81c397f831' 
  AND token = 'AI9gZ1gkh48XAH18wQWPs/i+aAA3eCfQR91AqGtEww4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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