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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b69efbfd191dba3b05ed208efa0a08ee975ed0cc48f9dfc198c998251f43151c' 
  AND token = 'BlhKVIPXYCJDjh3sJqo7AECSp4njBIRn5kN0EoH9qQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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