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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f596e2ebb2af1924898ff53e517fb5f0859db7804d938617c9769c31786c1a96' 
  AND token = 'xAY3Z8V5/AFEv6c9edb5g0qBYBFzTrZkEU9hprD8/RE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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