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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ee68b2daa9bc9be542ffe1a860b614cc210ccf28069db07a370f1b7fa1b8886' 
  AND token = '8k3eurXXNMnxqC/lan0SnQF4yU0IOSDVYvwZ9p6yHdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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