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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c2694387716db47373db37f37087dbfceaeaf0050e3e01c964b1929c1d20027' 
  AND token = 'dYz4cKwICKuu/74O02vryNlC1zGSJnNGglgMQDB0Tm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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