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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be364cb1a38788c07a9e92eea6c454c0b6be6f89f5fb32b4bdce0df0e5858c42' 
  AND token = '1ErydPRwgK6wvwfZiREe2jPwZJciLy7D1xGM7esllSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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