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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '141c6cd7ddf7f841ba1d81f252142534dfca89efdb57c9aa5d19a12c83a9815b' 
  AND token = 'RaSMeaxpmQlsrElYcbQ2+3TlYEHJHQTupR5jzNvc2oM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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