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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee774e3202eabf9b5837025ef249d4874cf37b66e8c3d20de1525f3cf7914867' 
  AND token = 'RndF4Lt5fd9sD7ri72gtlRqASigpYl75MIsUvLCZnis=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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