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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb968d92418f58e3cfb335f3f3b8dca0cd7a38d956e90f745c0345acb482601f' 
  AND token = 'DD6gD3gk0P2nN/5x7fJh0HgruNSsME92HLrSJGxqg1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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