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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '975eecbedad05ac7d1b6ac473c0c1aad998815e6aa63b340c495a2ecccf67722' 
  AND token = '55/TTe/JSA1aipK9Z1ITNE9Zcdpg9U6WtydvmnXsdzk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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