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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d68de7b9f543b8404dafef1c7c21f57b5c616f92ec0e12cf9562bcd3401e11' 
  AND token = 'xMh37Hjttszi9M8xx0shT5d+naSXO/GoqgtyE8NFjg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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