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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68ccf708baa49833d0c3ac6eece71fd3a02bb8564ded447a6a9a537cdacb2f97' 
  AND token = 'zvaLoB3HftnmcLMbDgEkvG6o+9XNFip2/AlxR6/bnrY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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