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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2d2c3e456c782c19214f4214c77222f1507c77763dd71b3054c27657f3a2ad' 
  AND token = 'Mn3FB5Dtv/xes6Jy6aDkcHKjYEbDmUxx7r+YuCF/DJU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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