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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c6abec8c6cf947f823902984e97ec9efe05f52845c4679b2d046568d9616ca0' 
  AND token = 'keD5ylkRYzZNc7V3HKtv8CwowNUIP8TR73EuUOc6U8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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