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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc7da26ac73562bf04c15627bd95696b58932e05df08348018f3c79658c2c23' 
  AND token = '9oiBv96g7070FLXc6sBDstCTvJ/hgr3Yr0w9+/0VSGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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