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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd863d1b75d60ea4948964970a5b789151d3fcc2ca93a2a13db5a7d11b0119ef8' 
  AND token = 'fa7pXN6coB6jJJYeT7N7y3J3HOKmVLHSUCNesTmWSZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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