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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2b62f9401896d82c4cd8692d687e3154cc7a185c24e5b539bfc181a4f570b5' 
  AND token = '5WLe8UZ3TlCExW/nOK1a5TZGUxr3aWQdEetL4m5+E2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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