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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '033c1da5d8653d8de593e737c26a831133dc7f1b50eb8485e17df51a27e1b346' 
  AND token = 'HMjLTJasnn5MnquVOh3DWWjyD58244VC8Lj4f5SKoWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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