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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9f1a307f1d984e2e5d085e11863c2e11c9aaca345af1094780ab826bdbdb4b' 
  AND token = 'ynzNYmhvBPOCPCkvsL/VIl7Nyw9b0DwMdwaZFFrasTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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