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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9772e75de580a23f9a52e3dcf7d8101821160f110165b6036a1431d490eaecf4' 
  AND token = 'cY2qoUO1bd0y6ORs39Xwl5QR94EW1AYZaJGLxdGhebc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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