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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '505164d5b8ca13f8b95394599492a14f7ab40a142002693a4d6eff1f47be965d' 
  AND token = '+R7WNUNtmwc43iXmufh+bD9Ii3cWWHOngiWOp2H6GLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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