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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6602091a90727b7580b5a974f2df57676c2743729bf39a715448c17b9303392' 
  AND token = '1CQjTVFF61XNqjJbC/usqQ6VgjQqnVpLu0s5Mjcua20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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