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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0557123120977f309451e8a5239d750af47588c409ec59ec5924cb4c6660d27' 
  AND token = 'skAwh4bUneQeSWGGy8QDAgh+bEV80P7m8AlXLuA//lU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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