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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa8d67dcf15c522a5b9329a5ab4fd8e1cb97d26c0929f28b7ede598ae4b7cb01' 
  AND token = 'FDpzALrx1zQtkcFVz3fcnjGVA6qlm2sd6Q/PHmmTcCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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