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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436ad2a7a700e9a602f58b441b9eaa10e73659d9fe9e4eab4bebd043866a5f0d' 
  AND token = 'NvZoqs2hBZ3c0FUsfOceNwkLW0V/Tkt1TZ87dHYA/HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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