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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f7003c7d86752314c5cceb9539c6f22b9b8a9c25ad8c1052c3817edff20cda' 
  AND token = 'MW7CaHNgchmbdd90S0Q8//ra2vfFj4CCun5H7WWy+Mk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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