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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '840ad4be4d33cdf362b0f43cfa03e7f2e1f34872874934b102bb16437e97da90' 
  AND token = '/S/GdIfVDI8joPEY1olPddqWj6VShR46cajXuJduHIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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