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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09107ad94307260d12160f8019df375ef89c5103e656c0820003f4b6f61efb3a' 
  AND token = '3XO14+FvAH85Nrtuv50lC9GtlllzRY5a5YjDM+N/L3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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