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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2d63b7dadd2739fde1a92aba713630d2a8d7eacf16e0c29499434e80da9319f' 
  AND token = '5WSesGS7cewkcsAJ8vnro8yUaZJd0rSuLfjIXyEDfl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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