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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '736d8da3cd552996f8ef31193e9a14e66809a8879fde50be89708dab0371acbc' 
  AND token = 'annDu1NC8lN5lTarj1EDQy1L2VwjSht7ZQmeCUwFi7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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