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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54da0126c5e1794abe78bfdd1e866d3dd20a472dfe4f95e4fc9191de3a6ad54f' 
  AND token = 'WQxM7HS2cKqbN0hvdyfq3HKMux6CpIVlXzLX3rhOjjU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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