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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '06d6ee2f6073c32d75f7d19e15ec0b605e4604cc686a6d8135808498cc8c294e' 
  AND token = 'kpHeiid2JwgiiCnQoSsqUef3P1SLJlb9/R5hq1ij0Og=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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