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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9f063e9580c4646bb0d5824ea54d7401a8dfda7a9401d14d5620bb294565780' 
  AND token = 'gAoIE6HQGFLB4DQEGioU8kJYuP2ecgCC+TuuBNinu+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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