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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6dea0a7b4b0d24efee402cff6168d616cdce23ed4c052718a3d1217c413a8289' 
  AND token = 'kxMsfAKkyC5fZyo0lqA4BhClMEl0POpWZi2Eds3l3U8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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