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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f651b658cdb346b09a26dcbb9761a5d4d7e537963d5772d36bfea29aba76358e' 
  AND token = 'YOl8SMbMBnUp+sqPvm+YRAs5u8SOZP9yq2u8VTQLzd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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